Question: What are the diplomatic rank which start with the letter P
Paraphrase: What are the discretionary rank which begin with the letter P
SPARQL (Wikidata): SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q303618 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'p')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
Answer: permanent representative, permanent representative